Hair drug testing: Many street drugs (or their breakdown products in the body) are absorbed into the hair. A sample of hair can be tested for recent drug use. Hair analysis: Testing of hair for toxic exposures, such as lead or mercury poisoning.
Gas Water Heater, water not hot enough-Thermostat or Sediment. The dip tube probably disintigrated. The dip tub sends cold water to the bottom of the tank for heating when its heated it rises to the top of the tank. Its possible that the dip tube broke of and now you have cold water mixing with the hot water on top.
If your radiator is very low on coolant, you'll get no heat. If your levels are ok, you either have a bad water pump or a thermostat that isn't opening. If your car has not been overheating or running hot, your water pump is not the culprit. It sounds like you are dealing with a failed thermostat. The thermostate opens and closes circuits in the cooling systems as the engine heats up.